I'm not sure it's an obligation. Afaik, It's a myth that you have to defend a copyright or risk losing it... but a trademark might be different?Apple has an obligation to defend their trademarks and servicemarks even in questionable cases or risk losing their protections. I don’t think they care if they lose, really, but they certainly need to ensure people are careful with coming close to their marks.
That would make sense. If too many logos are created that look too similar then eventually there isn't enough uniqueness to set it apart, making it generic and something that can't hold a trademark. Therefore you must defend against logos that are too similar.
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